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In Reply to: RE: actually posted by danlaudionut on November 06, 2009 at 23:21:08
Well, I guess theory is just that. I have 300B amps (Welborne Laurels), they have 3.5K OPTs, and a 1K ohm cathode resistor. They came with 47uf Solen cathode bypass caps. I changed them for 120uf Solens (that's what I had on hand), and noticed a very pronounced increase in bass. I've since gone to four 30uf 160V MBGO PIOs in parallel.
The math says (Rp+Rl/mu+1)//Rk is the impedance we need to bypass. So (600(Rp)+3500(Rl))/(2.77(mu)+1)= 1087. Rk = 1000//1087 = 520.8 ohm impedance. I think we can both agree on that. At 7hz C=1/(2*pi*7*520)= 43.656uf so according to the theory, a 47uf cap should be flat at 28hz. Why do my 30hz (they fall like a rock after that) capable speakers reproduce so much more bass with a 120uf cap? I guess it must be my imagination, theory says so.
I usually use 3hz as the frequency of interest which would indicate about 100uf. From previous posts, I see Tre' likes to use 2hz, which would indicate about 150uf. He uses 2hz as he claims the phase is correct. I don't know about the phase thing, but it is interesting, and I will look into it.
twystd
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